Another way of saying "dickhead". It can be used in situations where cursing is frowned upon. ie - certain people in the office, in front of grandma, in front of children
"Dad, Johnny keeps stealing my crayon."
"Johnny, stop taking his crayons and quit being a wiener brain!"

"Did you meet your sister's new boyfriend?"
"Yeah, he seems like a real... (granny stares) wiener brain."
by JJGene December 14, 2011
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